Image capaturing and image restoration implentmented by Phase-diverse Speckle(PDS) were researched in this paper.A PDS experimental platform with two cameras was designed for the extended object in our lab. Two cameras were taken to capture the short-expose images in focus and defocus simultaneously and a deformable mirror was used to construct optics system error.Then an electrical dryer was used to simulate the atmosphere turbulence. The problems from the two cameras were compared with that from single camera. Furthermore, the PD destination function was derived when the two cameras have different readout noises and how to solve the image rotation between the multi-channels was given. Finally, the capability of PDS method for image resolution improvement was validated. The PDS processes by single frame, 3 frames and 10 frames were execussed, respectively, and results show that the PDS technique can generate images with highly improved quality compared with the traditional PD method.